diff --git a/src/policy_cache.cpp b/src/policy_cache.cpp
index e69de29b..fad13f2b 100644
--- a/src/policy_cache.cpp
+++ b/src/policy_cache.cpp
@@ -0,0 +1,5 @@
+#pragma once
+
+#define STRPOOL_IMPLEMENTATION
+
+#include "strpool.h"